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Sunday, 22 September 2019
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Raw materials & technologies, Raw materials, Coatings binders

Polythiourethane networks catalysed by photobase generators

Monday, 31 October 2016

In a paper, French researchers have studied the photoinitiated polymerisation of thiols with isocyanate by real-time FTIR.

Different structures of photobase generators (PBG) based on quaternary ammonium salts of phenylglyoxylic acid were used as catalysts, releasing either weak or strong bases.

Efficient catalysts for cure-on-demand

A fast reaction leading to high conversion was possible only when 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) or 1,1,3,3-tetramethylguanidine (TMG) are released from the corresponding PBG.

The study is published in: Progress in Organic Coatings, Volume 100, November 2016, Pages 81–85

Polythiourethane networks catalysed by photobase generators. Source: Maik Schwertle/pixelio.de

Polythiourethane networks catalysed by photobase generators. Source: Maik Schwertle/pixelio.de

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